EP3881618B1 - Accès à un spectre partagé pour des communications de diffusion et bidirectionnelles à commutation de paquets - Google Patents

Accès à un spectre partagé pour des communications de diffusion et bidirectionnelles à commutation de paquets Download PDF

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Publication number
EP3881618B1
EP3881618B1 EP19802006.7A EP19802006A EP3881618B1 EP 3881618 B1 EP3881618 B1 EP 3881618B1 EP 19802006 A EP19802006 A EP 19802006A EP 3881618 B1 EP3881618 B1 EP 3881618B1
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European Patent Office
Prior art keywords
broadcast
cellular
base station
eutra
frequency band
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German (de)
English (en)
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EP3881618A1 (fr
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Kevin A. Shelby
Durga P. Prasad
Sundeep MAVUDURU KANNAPPA
Mark Earnshaw
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Coherent Logix Inc
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Coherent Logix Inc
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Priority claimed from US16/186,768 external-priority patent/US11234288B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the present application relates to dynamic spectrum sharing for wireless communications.
  • Wireless communication systems are rapidly growing in usage. Further, wireless communication technology has evolved from voice-only communications to also include the transmission of data, such as Internet and multimedia content.
  • the proliferation of wireless communications may lead to a scarcity of frequency spectrum. Further, utilization of different portions of the spectrum may vary. For example, during some intervals cellular communications in a particular frequency band may be high. At the same time, broadcast television (TV) providers may not be utilizing all of their allotted frequency resources.
  • TV broadcast television
  • a broadcast base station is configured to wirelessly broadcast audio and video data to a plurality of broadcast receiver devices using a particular frequency band.
  • the broadcast base station is configured to discontinue broadcasting in the particular frequency band during a scheduled time interval, to enable one or more cellular base stations to perform bi-directional packet-switched wireless data communications using the particular frequency band.
  • US 2017/0257838 A1 discloses aspects that relate to wireless communications and, more particularly, to synchronization for standalone long term evolution (LTE) broadcast.
  • a method is provided which may be performed by a wireless device such as a user equipment (UE).
  • UE user equipment
  • the method generally monitoring, within anchor subframes occurring at a first periodicity, for synchronization signals of a first type, obtaining an indication of one or more unicast subframes scheduled to occur between anchor subframes, and obtaining an indication of one or more broadcast subframes scheduled to occur between anchor subframes.
  • US 2010/0009687 A1 discloses a system and method by which individual user equipment items can be informed about subframes re-used or exceptionally used for unicast transmission.
  • a dedicated indication is transmitted to each item of user equipment. This indication may comprise, for example, a dedicated message transmitted to those user equipment items that will get additional unicast downlink allocations in the re-used subframes.
  • common broadcast signaling is used to indicate subframe re-use to all items of user equipment.
  • This signaling may be transmitted on a physical downlink control channel (PDCCH) or on a physical downlink shared channel (PDSCH) as a common broadcast message.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • US 2016/0212626 A1 discloses a method for operating an extensible mode of communication in an intelligent heterogeneous network includes the step of using an extensibility tool to provide an extensible framing structure. The method further includes the step of combining a centralized radio access network topology with an intelligent IP core network to enable sharing of spectrum resources. The method further includes the step of providing a supplemental return channel to facilitate paging.
  • a broadcast base station is configured to wirelessly broadcast audio and video data to multiple broadcast receiver devices using a particular frequency band.
  • the broadcast base station is configured to discontinue broadcasting in the particular frequency band during a scheduled time interval, to enable one or more cellular base stations to perform bi-directional packet-switched wireless data communications using the particular frequency band.
  • a base station e.g., a Long Term Evolution (LTE) base station
  • LTE Long Term Evolution
  • the base station is also configured to perform bi-directional packet-switched communication with one or more mobile devices using a second frequency band during a scheduled time interval, wherein the second frequency band is used for wirelessly broadcasting audio and video data to multiple devices during one or more time intervals other than the scheduled time interval.
  • the disclosed techniques may allow for dynamic spectrum sharing between cellular and broadcast communications.
  • a single base station is configured as both a broadcast base station and a cellular base station.
  • mobile devices are configured to switch between frequency bands in order to take advantage of shared spectrum.
  • mobile devices may be configured to power down during blanking intervals for a corresponding radio technology (during which communications in the same spectrum by another radio technology may occur).
  • control signaling transmitted by cellular base stations and/or broadcast base stations may enable wireless receiver devices to maintain connectivity during dynamic spectrum sharing.
  • Various units, circuits, or other components may be described or claimed as “configured to” perform a task or tasks.
  • “configured to” is used to connote structure by indicating that the units/circuits/components include structure (e.g., circuitry) that performs the task or tasks during operation.
  • the unit/circuit/component can be said to be configured to perform the task even when the specified unit/circuit/component is not currently operational (e.g., is not on).
  • the units/circuits/components used with the "configured to” language include hardware-for example, circuits, memory storing program instructions executable to implement the operation, etc.
  • FIG. 1 illustrates an example user equipment (UE) 106 according to some embodiments.
  • the term UE 106 may be any of various devices as defined above.
  • UE device 106 may include a housing 12 which may be constructed from any of various materials.
  • UE 106 may have a display 14, which may be a touch screen that incorporates capacitive touch electrodes. Display 14 may be based on any of various display technologies.
  • the housing 12 of the UE 106 may contain or comprise openings for any of various elements, such as button 16, speaker port 18, and other elements (not shown), such as a microphone, data port, and possibly various types of buttons, e.g., volume buttons, ringer button, etc.
  • the UE 106 may support multiple radio access technologies (RATs).
  • RATs radio access technologies
  • UE 106 may be configured to communicate using any of various RATs such as two or more of Global System for Mobile Communications (GSM), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access (CDMA) (e.g., CDMA2000 1XRTT or other CDMA radio access technologies), Long Term Evolution (LTE), LTE Advanced (LTE-A), and/or other RATs.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • CDMA Code Division Multiple Access
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • the UE 106 may support at least two radio access technologies such as LTE and GSM.
  • Various different or other RATs may be supported as desired.
  • UE 106 is also configured to receive broadcast radio transmissions which may convey audio and/or video content.
  • a UE 106 may be configured to receive broadcast radio transmissions and may not be configured to perform bi-directional communications with a base station (e.g., UE 106 may be a television).
  • Figure 2 illustrates an exemplary (and simplified) wireless environment that includes multiple communication systems.
  • different UEs and broadcast receivers are configured to communicate via a broadcast network and/or a packet-switched cellular network.
  • the system of Figure 2 is merely one example of possible systems, and embodiments may be implemented in any of various systems, as desired.
  • the exemplary wireless communication system includes base stations 102A and 102B which communicate over a transmission medium with one or more user equipment (UE) devices, represented as UEs 106A-106C.
  • UE user equipment
  • Cellular base station 102B may be a base transceiver station (BTS) or cell site, and may include hardware that enables wireless communication with the UE 106B and UE 106C.
  • base station 102B is also configured to communicate with a core network 100B.
  • Core network 100B may also be coupled to one or more external networks (such as external network 108), which may include the Internet, a Public Switched Telephone Network (PSTN), and/or any other network.
  • PSTN Public Switched Telephone Network
  • the base station 102B may facilitate communication between the UE devices 106B and 106C and/or between the UE devices 106B and/or 106C and the networks 100B, and/or 108.
  • Base station 102B and other base stations operating according to the same or different RATs or cellular communication standards may be provided as a network of cells, which may provide continuous or nearly continuous overlapping service to UE 106B and/or UE 106C and similar devices over a wide geographic area via one or more radio access technologies (RATs).
  • RATs radio access technologies
  • Broadcast base station 102A may be configured to broadcast multimedia content (e.g., video and audio content for TV transmissions) to a plurality of receivers such as UEs 106A and 106B.
  • broadcast base station 102A is configured to communicate with external network 108.
  • broadcast base station 102A is also configured to communicate with one or more internal networks.
  • broadcast refers to one-to-many transmissions that are transmitted for receiving devices in a broadcast area rather than being addressed to a particular device.
  • broadcast transmissions are typically one-directional (from transmitter to receiver).
  • control signaling e.g., ratings information
  • cellular communication is typically bi-directional.
  • Cellular communications also may involve handover between cells.
  • UE 106C when UE 106C (and/or UE 106B) moves out of the cell served by cellular base station 102B, it may be handed over to another cellular base station (and the handover may be handled by the network, including operations performed by base station 102B and the other cellular base station).
  • a user when a user moves from the range covered by a first broadcast base station to the range covered by a second broadcast base station, it may switch to receiving content from the second broadcast base station, but the base stations do not need to facilitate handover (e.g., they simply continue broadcasting and do not care which base station a particular UE is using).
  • broadcast transmissions are performed using different frequency resources than cellular transmissions.
  • frequency resources are shared between these different types of transmissions.
  • broadcast base station 102A is configured to relinquish one or more frequency bands during scheduled time intervals for use by cellular base station 102B for packet-switched communications.
  • Dynamic spectrum sharing gives rise to the potential for explicit coordination between networks to ensure seamless end user connectivity. Dynamic spectrum sharing may provide means for a broadcast operator to derive additional revenue by temporarily relinquishing use of its spectrum holdings, in part or in whole, to a wireless carrier, e.g., under expressed written agreement between the respective network operators.
  • a configurable base station versed in the complement of underlying signaling protocols, may facilitate uninterrupted connectivity from end user devices seeking either broadcast or broadband service access (or both) at a given point in time.
  • control signaling transmitted by a broadcast or cellular base station may allow end user devices to maintain full signaling connectivity (which may eliminate network churn), extend battery life (e.g., by determining when to remain in a low power mode when a base station is not transmitting), and/or actively manage coverage detection (e.g., rather than perceiving spectrum sharing periods as spotty coverage or a temporary network outage).
  • a broadcast operator may relinquish its spectrum to a cellular operator for a scheduled time period with no intervening signaling to the broadcast receiver.
  • the broadcast network is inaccessible for the duration of the deferral period, leaving its receivers unaware of network status until broadcast services resume. This may be referred to as unilateral deferral.
  • the cellular operator may periodically blank its transmission to enable the broadcast operator to transmit control signaling informing broadcast receivers of its dormant period. This may notify broadcast receivers of blanking periods, but may not allow them to continue receiving broadcast data. This may be referred to as joint deferral.
  • control signaling for broadcast transmissions may include sufficient synchronization information to allow broadcast receivers to receive broadcast content in active intervals (e.g., intervals between broadcast blanking intervals during which cellular data is transmitted). This may involve superimposing cellular synchronization and cell configuration parameters with broadcast frame parameters, in some embodiments.
  • the base stations 102A and 102B and the UEs 106A, 106B, and 106C may be configured to communicate over the transmission medium using any of various RATs (also referred to as wireless communication technologies or telecommunication standards), such as LTE, Next Generation Broadcast Platform (NGBP), W-CDMA, TDS-CDMA, and GSM, among possible others such as UMTS, LTE-A, CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), Advanced Television Systems Committee (ATSC) standards, Digital Video Broadcasting (DVB), etc.
  • LTE Long Term Evolution
  • NGBP Next Generation Broadcast Platform
  • W-CDMA Wideband Code Division Multiple Access
  • TDS-CDMA Time Division Multiple Access
  • GSM Global System for Mobile communications
  • UMTS Long Term Evolution
  • LTE-A Long Term Evolution
  • CDMA2000 e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD
  • ATSC Advanced Television
  • Broadcast and cellular networks are discussed herein to facilitate illustration, but these technologies are not intended to limit the scope of the present disclosure and the disclosed spectrum sharing techniques may be used between any of various types of wireless networks, in other embodiments.
  • FIG 3 illustrates an exemplary block diagram of a base station 102.
  • base station 102 may be a broadcast base station such as base station 102A of Figure 2 and/or a cellular base station such as base station 102B of Figure 2 . It is noted that the base station of Figure 3 is merely one example of a possible base station.
  • the base station 102 may include processor(s) 304 which may execute program instructions for the base station 102.
  • the processor(s) 304 may also be coupled to memory management unit (MMU) 340, which may be configured to receive addresses from the processor(s) 304 and translate those addresses to locations in memory (e.g., memory 360 and read only memory (ROM) 350) or to other circuits or devices.
  • MMU memory management unit
  • the base station 102 may include at least one network port 370.
  • the network port 370 may be configured to couple to a telephone network and provide a plurality of devices, such as UE devices 106, access to the telephone network as described above.
  • the network port 370 (or an additional network port) may be coupled to a television network and configured to receive content for broadcasting.
  • the network port 370 (or an additional network port) may also or alternatively be configured to couple to a cellular network, e.g., a core network of a cellular service provider.
  • the core network may provide mobility related services and/or other services to a plurality of devices, such as UE devices 106.
  • the network port 370 may couple to a telephone network via the core network, and/or the core network may provide a telephone network (e.g., among other UE devices 106 serviced by the cellular service provider).
  • the base station 102 may include at least one antenna 334.
  • the at least one antenna 334 may be configured to operate as a wireless transceiver and may be further configured to communicate with UE devices 106 via radio 330.
  • the antenna 334 communicates with the radio 330 via communication chain 332 in the illustrated embodiment.
  • Communication chain 332 may be a receive chain, a transmit chain or both.
  • the radio 330 may be configured to communicate via various RATs.
  • the processor(s) 304 of the base station 102 may be configured to implement part or all of the methods described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium).
  • the processor 304 may be configured as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit), or a combination thereof.
  • base station 102 is configured to perform both broadcast and bi-directional packet-switched communications.
  • base station 102 may include multiple radios 330, communication chains 332, and/or antennas 334, for example.
  • the disclosed spectrum sharing techniques may be performed by different base stations configured to perform only broadcast transmissions or only packet-switched communications.
  • FIG. 4 illustrates an example simplified block diagram of a UE 106.
  • the UE 106 may include a system on chip (SOC) 400, which may include portions for various purposes.
  • the SOC 400 may be coupled to various other circuits of the UE 106.
  • the UE 106 may include various types of memory (e.g., including NAND flash 410), a connector interface 420 (e.g., for coupling to a computer system, dock, charging station, etc.), the display 460, wireless communication circuitry 430 such as for LTE, GSM, Bluetooth, WLAN, and/or broadcast, etc.
  • the UE 106 may further comprise one or more smart cards that implement SIM (Subscriber Identity Module) functionality.
  • the wireless communication circuitry 430 may couple to one or more antennas, such as antenna 435.
  • the SOC 400 may include processor(s) 402 which may execute program instructions for the UE 106 and display circuitry 404 which may perform graphics processing and provide display signals to the display 460.
  • the processor(s) 402 may also be coupled to memory management unit (MMU) 440, which may be configured to receive addresses from the processor(s) 402 and translate those addresses to locations in memory (e.g., memory 406 or NAND flash memory 410) and/or to other circuits or devices, such as the display circuitry 404, wireless communication circuitry 430, connector I/F 420, and/or display 460.
  • the MMU 440 may be configured to perform memory protection and page table translation or set up. In some embodiments, the MMU 440 may be included as a portion of the processor(s) 402.
  • UE 106 is configured to receive wireless broadcasts, e.g., from broadcast base station 102A of Figure 2 .
  • 106 may include a broadcast radio receiver.
  • UE 106 is configured to receive broadcast data and perform packet-switched cellular communications (e.g., LTE) at the same time using different frequency bands and/or the same frequency resources during different time slices. This may allow users to view TV broadcasts while performing other tasks such as browsing the internet (e.g., in a split-screen mode), using web applications, or listening to streaming audio.
  • the disclosed techniques may be used in systems with devices that are configured as broadcast receivers or for cellular communications, but not both.
  • the processor 402 of the UE device 106 may be configured to implement part or all of the features described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium).
  • processor 402 may be configured as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit).
  • the processor 402 of the UE device 106 in conjunction with one or more of the other components 400, 404, 406, 410, 420, 430, 435, 440, 460 may be configured to implement part or all of the features described herein.
  • Figure 5 illustrates a generalized broadcast super-frame structure 502, according to some embodiments.
  • the super-frame occupies a 1-second duration that is independent of underlying frame configuration. In some embodiments, this fixed duration may facilitate coordination with a cellular network transport layer.
  • the illustrated super-frame 502 includes a payload region 504 which carries actual payload data, and zero or more non-payload regions 506 and 508 which may carry control or other signaling information. In the example shown, separate non-payload regions 506 and 508 are indicated by the shaded areas at the beginning and end of the frame 502. The relative lengths in time (horizontal axis) and numbers of symbols for each region may not be shown to scale in this example diagram.
  • the initial non-payload region 506 serves as a preamble that provides initial synchronization and frame configuration to receiver devices.
  • detection of a particular preamble may set the context by which the remaining preamble symbols are to be detected. For example, if base station 102A relinquishes a portion of its spectrum to LTE, it may indicate a separate context signaled in the broadcast preamble as "private".
  • other fields may indicate various information to receiving devices, e.g. how long the transport will be occupied and the bandwidth of the signal. For example, a broadcast receiver device may use this information to determine when to begin monitoring for broadcast data again. A cellular device may use this information to determine how long it can transmit data in a borrowed frequency band.
  • broadcast receivers are configured to ignore super-frames that belong to a service context other than that which the broadcast device is equipped to receive.
  • FIG. 6 illustrates an exemplary cellular radio frame (an LTE frame in the illustrated example).
  • a cellular radio frame 602 comprises multiple subframes 604.
  • each subframe is 1ms in length and is composed of two 0.5ms slots 606.
  • the illustrated frame may be used for bi-directional, packet-switched cellular communications, in various embodiments.
  • PSS and SSS Primary and secondary synchronization signals, PSS and SSS, are inserted in subframes 0 and 5 in slots 0 and 10, in the illustrated embodiment.
  • PSS may be transmitted identically in both subframes.
  • the SSS contents may be modified in the second instance per frame, which may enable the UE to uniquely determine the start of a 10ms radio frame.
  • PSS and SSS are immediately followed by a physical broadcast channel (BCH) 610 only in the first subframe of a radio frame.
  • BCH physical broadcast channel
  • the BCH may convey frame configuration to the broadband receiver.
  • broadcast in the context of BCH refers to control signaling that is distributed equally to receivers within an LTE cell and is thus different than broadcast data content distributed by a broadcast base station.
  • Figure 7 illustrates incorporation of universal signaling into an LTE frame structure.
  • control signaling may be used to indicate time intervals during which frequency bands will be available. This may signal to broadcast and broadband receivers alike the intended use of spectrum resources in any given frame period.
  • a preamble 702 is transmitted in the first LTE subframe 704 corresponding to the start of the broadcast super-frame duration 706. In some embodiments, this may require synchronization of the broadcast super-frames with LTE frames (e.g., the super-frame should begin at the same time as an LTE frame, in some embodiments).
  • Preamble 702 may be a "hybrid" preamble in the sense that both broadcast and cellular control signaling are transmitted by the respective networks during the preamble interval. This signaling may be transmitted using different time and/or frequency resources to avoid interference, in some embodiments.
  • the broadcast portion of preamble 702 contains initial synchronization information plus any additional configuration parameters the broadband provider wishes to advertise in the broadcast cell.
  • the first broadcast symbol is sent as it would be in a normal broadcast mode, which may ensure robust signal detection.
  • the remaining symbols transmitted from the broadband base station are modified (e.g., by blanking at least a portion of the frequency spectrum during these intervals) as needed to accommodate signaling fields destined for the cellular receiver, e.g. PSS, SSS and BCH, enabling continued network connectivity despite the presence of the surrounding broadcast signaling.
  • broadcast symbols overlapping the broadband signaling fields 708 are notched to accommodate PSS, SSS and BCH.
  • these cellular fields nominally occupy 72 subcarriers surrounding the center carrier at 15 kHz subcarrier spacing (1.080 MHz).
  • the broadcast base station 102A may zero out the equivalent signal bandwidth to avoid compromising the integrity of the cellular signaling fields.
  • cellular base station 102B may suspend scheduling of user data in subframe zero as it overlaps the broadcast preamble 702.
  • the data loss in subframes available for user data scheduling (1/1000 th in the illustrated embodiment) may be inexpensive relative to the ability to share frequency spectrum with the broadcast base station 102A. Normal cellular data scheduling may resume after subframe zero for the remainder of the super-frame duration.
  • a single base station (e.g., a base station configured for both broadcast and cellular transmissions) may be configured to transmit the entire preamble 702. Further, in some embodiments, a cellular base station may be configured to transmit a portion of the broadcast control signaling and/or vice versa, to facilitate scheduling.
  • a configurable eNB is configured to transmit both NGBP (broadcast) and EUTRA (Evolved Universal Terrestrial Radio Access) (LTE, Long Term Evolution) (cellular) signals using similar bandwidths in the same frequency spectrum by time interleaving the two signals. Maintaining correct time alignment between the NGBP and EUTRA signals may be relatively simple if the same base station (eNB, evolved Node B) is transmitting both signals.
  • an eNB may transmit a single signal, portions of which correspond to the NGBP waveform while other portions of the signal correspond to the EUTRA waveform.
  • coordination between the different networks may be needed for the time alignment.
  • NGBP and LTE utilize NGBP and LTE for illustrative purposes, but similar techniques may be used for other broadcast and/or cellular protocols (such as NGBP, GSM, etc.) or may be used for protocols that are not broadcast or cellular in nature in other embodiments.
  • MBSFN Multicast/Broadcast Single Frequency Network
  • a EUTRA downlink signal may be configured with MBSFN subframes.
  • subframes 1, 2, 3 and 6, 7, 8 of each 10 ms EUTRA radio frame may be configured as MBSFN subframes.
  • MBSFN subframes may have the property that an EUTRA signal need only be transmitted in the first 1 or 2 OFDM (Orthogonal Frequency Division Multiplexing) symbols of a 1 ms subframe, while the remaining 13 or 12 OFDM symbols respectively may be left blank with no signal being transmitted.
  • OFDM Orthogonal Frequency Division Multiplexing
  • no EUTRA reference symbols need be transmitted in the OFDM symbols belonging to the MBSFN region of an MBSFN subframe.
  • a blank area with a time length of 0.857 ms (12 OFDM symbols) or 0.929 ms (13 OFDM symbols) may exist in each MBSFN subframe.
  • MBSFN subframes with this blank area correspond to approximately 10500 or 11400 samples available for NGBP use in the blank areas of the MBSFN subframes for blank areas of length 12 or 13 OFDM symbols, respectively.
  • this is an example sampling rate, and higher sampling rates for NGBP have also been proposed and could be selected in a dynamic fashion.
  • this set of samples is sufficient for either two NGBP OFDM symbols using a 4096 FFT (Fast Fourier Transform) or one NGBP OFDM symbol using an 8192 FFT, plus an appropriately-sized cyclic prefix.
  • An NGBP frame may be configured with multiple partitions, which may be referred to as Physical Partition Data CHannels (PPDCH).
  • PPDCH Physical Partition Data CHannels
  • Exemplary techniques for forming broadcast frame payloads with multiple PPDCHs are discussed in U.S. Pat. Appl. No. 14/805,004 "Multi-Partition Radio Frames," which was filed July 21, 2015 , has issued as U.S. Patent. No. 9,438,459 .
  • one or more PPDCHs may be configured to carry the NGBP data during the blank areas of the EUTRA MBSFN subframes, while one or more blanking PPDCHs may be configured to correspond to the active portions of the EUTRA signals.
  • NGBP PPDCHs may be configured such that no NGBP signal is transmitted during those PPDCHs (including suppressing any NGBP reference symbols), so as not to interfere with the EUTRA signal.
  • broadcast base station 102A is configured to inform NGBP receivers that NGBP reference symbols will not be transmitted during blank partitions, and the NGBP receivers may take this information into account while performing channel estimation.
  • the disclosed techniques may be implemented using LTE time division duplex (TDD) radio frames, LTE frequency division duplex (FDD) radio frames, and/or other types of radio frames in various embodiments or situations.
  • TDD time division duplex
  • FDD frequency division duplex
  • signaling information may be transmitted during different time and/or frequency portions of the cellular frames.
  • Fig. 8 is a signal diagram illustrating an exemplary time interleaving between broadcast and cellular transmissions, according to some embodiments. This example uses a sampling rate of 12.288 Msps for NGBP, but various sampling rates may be used as appropriate. Note that while Fig. 8 shows a particular frequency band, broadcast transmissions may or may not continue on other frequency bands during relinquishment of the illustrated band.
  • PPDCHs 0, 1, and 2 carry NGBP broadcast data.
  • each of these PPDCHs is configured to use an FFT size of 4096, with a cyclic prefix length of 512 samples. This results in a total of 9216 samples for two consecutive OFDM symbols, which fits within the blank area of an EUTRA MBSFN subframe, in the illustrated embodiment.
  • PPDCH 0 has a periodicity of 5 ms to cover MBSFN subframes 1 and 6
  • PPDCH 1 has a periodicity of 5 ms to cover MBSFN subframes 2 and 7
  • PPDCH 2 has a periodicity of 5 ms to cover MBSFN subframes 3 and 8.
  • PPDCH 3 is a blank partition that corresponds to the initial portion of each MBSFN subframe (which carries an active EUTRA signal).
  • a 1 ms EUTRA subframe corresponds to 12288 NGBP samples during the same time period.
  • 9216 are assigned to PPDCH 0, 1, or 2, depending upon the actual subframe index in question.
  • PPDCH 3 may have a periodicity of 1 ms to cover the initial portion of each subframe (as well as a small part of the final portion of the preceding subframe, in this example).
  • PPDCH 4 and 5 are blank partitions that correspond to the active EUTRA portions of non-MBSFN subframes 0, 4, 5, and 9. These two partitions may use the same configurations as data-carrying partitions 0, 1, 2 (i.e. two OFDM symbols with an FFT size of 4096 and a cyclic prefix length of 512 samples or one OFDM symbol with an FFT size of 8192 and a cyclic prefix length of 1024 samples, and a periodicity of 5 ms).
  • shaded areas represent an active transmission for the corresponding waveform, while unshaded areas represent no active transmission for the corresponding waveform.
  • the active portions of the NGBP signal PPDCHs 0, 1, and 2 fall within the non-active portions of the EUTRA signal (the MBSFN portions of EUTRA subframes 1, 2, 3 and 6, 7, 8) (and vice versa), so that there is no collision between the two waveforms.
  • the control signaling transmitted in (e.g., in a preamble at the beginning of) an NGBP frame may correspond to multiple LTE subframes.
  • the length of the PFCCH (Physical Format Control CHannel) and PCCCH (Physical Content Control CHannel), both of which are discussed in the '004 Patent Application and corresponding '459 Patent, together may likely interfere with several of the EUTRA subframes. This may happen only once per NGBP frame, however, e.g., once per second.
  • the PFCCH and PCCCH locations are time-aligned with MBSFN subframes to minimize impact on EUTRA user devices.
  • the cellular base station 102B is configured to avoid scheduling transmissions to EUTRA devices during any overlap period with the NGBP PFCCH and PCCCH in order to reduce potential signal collisions.
  • a particular preamble value for the PFCCH may be used to signal the NGBP receivers that the PCCCH format is a special format (e.g. with some time gaps to avoid interfering with non-MBSFN subframes) rather than a normal NGBP signal.
  • these signals may occupy the same (or similar) bandwidths with the same carrier frequency, which may avoid RF issues such as needing to retune the radio to a different frequency when switching between the two signals.
  • the signals may occupy different, overlapping bandwidths and/or use different carrier frequencies.
  • spectrum sharing techniques may be used to share spectrum between broadcasts of local content and broadcast of regional content (where regional content refers to content intended for a larger area than the local content).
  • a single base station is configured to transmit both types of content, and is configured to transmit the local content in some partitions of a broadcast frame and the regional content in other partitions of a broadcast frame.
  • the local/regional content may also be targeted for particular types of devices, e.g., mobile devices, fixed devices, etc.
  • a regional broadcast base and one or more local broadcast base stations may be configured to share spectrum.
  • the regional broadcast base station may be configured to blank partitions corresponding to transmissions by the one or more local base stations.
  • the base stations may communicate to coordinate synchronization of broadcast frames and/or to configure which base stations transmit or blank during which intervals.
  • time slices for use of spectrum in the same frequency band may be allocated to: local broadcast content, regional broadcast content, and bi-directional packet-switched communications.
  • spectrum may be allocated using an exchange over which broadcast providers can list spectrum that they are willing to relinquish and cellular providers can purchase use of the listed spectrum.
  • Broadcast providers may list particular percentages of the time that they are willing to relinquish spectrum (e.g., based on the size of partitions in broadcast frames that they are willing to blank), particular intervals during which they are willing to relinquish spectrum, etc.
  • the exchange may also allow providers to coordinate frame synchronization and configuration of which base stations are configured to blank during what time intervals.
  • a centralized system is configured to determine and indicate spectrum sharing configurations, but is not configured to do so via an exchange.
  • decisions on how to share spectrum may be made in a distributed manner.
  • a broadcast base station may determine its spectrum usage based on current programming and communicate its ability to relinquish spectrum to nearby cellular base stations.
  • the nearby base stations e.g., stations with overlapping coverage areas
  • These communications between broadcast and/or cellular base stations may or may not be performed wirelessly.
  • fields for such communications may be added to cellular and/or broadcast frame structures.
  • Fig. 9 a flow diagram illustrating one exemplary embodiment of a method for operating a broadcast base station is shown.
  • the method shown in Fig. 9 may be used in conjunction with any of the computer circuitry, systems, devices, elements, or components disclosed herein, among other devices.
  • some of the method elements shown may be performed concurrently, in a different order than shown, or may be omitted. Additional method elements may also be performed as desired.
  • broadcast base station 102A wirelessly broadcasts audio and video data to a plurality of broadcast receivers using a particular frequency band. In some embodiments, this may be a portion of the UHF band, which ranges from 470 to 884 MHz. In other embodiments, any of various frequency bands may be utilized.
  • broadcast base station 102A discontinues broadcasting on the particular frequency band during a scheduled time interval to enable one or more cellular base stations (e.g., cellular base stations 102B) to perform bi-directional packet-switched wireless data communications using the particular frequency band.
  • the particular frequency band may be only a portion of the spectrum in which the broadcast base station is configured to transmit while in other situations the broadcast base station may relinquish its entire spectrum.
  • the scheduled time interval may correspond to a portion of a 1 ms LTE subframe.
  • the base station is configured to transmit on the particular frequency band during other scheduled time intervals, e.g., during other subframes of a particular LTE frame.
  • the base station is configured to transmit control signaling to receiving user devices and the control signaling indicates time intervals during which the broadcast base station will blank transmissions.
  • Fig. 10 a flow diagram illustrating one exemplary embodiment of a method for operating a cellular base station is shown.
  • the method shown in Fig. 10 may be used in conjunction with any of the computer circuitry, systems, devices, elements, or components disclosed herein, among other devices.
  • some of the method elements shown may be performed concurrently, in a different order than shown, or may be omitted. Additional method elements may also be performed as desired.
  • cellular base station 102B performs bi-directional packet-switched communication with one or more mobile devices using a first frequency band.
  • the first frequency band may be a band assigned to a cellular provider associated with base station 102B for cellular communications.
  • cellular base station 102B performs communication with one or more mobile devices using a second frequency band during a scheduled time interval.
  • the second frequency band is used for wirelessly broadcasting audio and video data to a plurality of devices during one or more time intervals other than the scheduled time interval.
  • the second frequency band may be assigned to a broadcast provider associated with broadcast base station 102A.
  • the broadband provider may agree, however, not to use at least a portion of its spectrum during the scheduled time interval.
  • cellular base station 102B may include multiple radios configured to communicate using the different first and second frequency bands. The cellular base station 102B may notify UEs to communicate via the second frequency band during the scheduled time interval.
  • Fig. 11 a flow diagram illustrating one exemplary embodiment of a method for operating a UE is shown.
  • the method shown in Fig. 11 may be used in conjunction with any of the computer circuitry, systems, devices, elements, or components disclosed herein, among other devices.
  • some of the method elements shown may be performed concurrently, in a different order than shown, or may be omitted. Additional method elements may also be performed as desired.
  • a UE performs bi-directional packet-switched wireless data communications with a base station using a first frequency band. In some embodiments, this may be performed within a cellular frequency band, which may vary from country to country, but are often specified in bands of 10 to 100 MHz between 700 MHz and 3600 MHz.
  • the LTE in response to receiving control signaling from the base station, performs bi-directional packet-switched wireless data communications using a second frequency band during a scheduled time interval.
  • the second frequency band is used for wirelessly broadcasting audio and video data to a plurality of devices during one or more time intervals other than the scheduled time interval. This may allow the LTE to communicate using frequency bands normally reserved for broadcast transmissions, which may increase data rates, reduce power consumption, increase battery life, etc., relative to communicating in a congested frequency band.
  • FIG 12 shows an overview of an ATSC 3.0 physical layer frame.
  • ATSC 3.0 frames are discussed here for purposes of illustration, but are not intended to limit the scope of the present disclosure. Similar techniques may be applied to physical layer frames of any of various broadcast standards.
  • each physical layer frame includes a bootstrap portion at the beginning of the frame, immediately followed by a preamble portion which contains control signaling information, and then one or more subframes which contain actual payload data in the form of Physical Layer Pipes (PLPs).
  • PLPs Physical Layer Pipes
  • a typical ATSC 3.0 broadcast waveform includes multiple physical layer frames time-division multiplexed together in the same RF channel.
  • Figure 13 shows an example of one such time-division multiplexing of physical layer frames.
  • ATSC 3.0 physical layer frames are either time-aligned or symbol-aligned.
  • Time-aligned frames have a total length corresponding to an integer multiple of 5 ms, in the range from 50 ms to 5 s, inclusive.
  • Symbol-aligned frames generally have a frame length that is not an integer number of milliseconds, where the total frame length of a symbol-aligned frame is equal to the sum of the lengths of the bootstrap and the OFDM symbols which comprise the preamble and subframe portions of the frame.
  • the length of a symbol-aligned frame can be measured in units of samples, where the sampling rate depends on the configured system bandwidth of the ATSC 3.0 waveform as shown in the following table of ATSC 3.0 sampling rates as a function of system bandwidth Svstem Bandwidth Sampling Rate 6 MHz 6.912 Msps 7 MHz 8.064 Msps 8 MHz 9.216 Msps
  • An ATSC 3.0 physical layer frame always begins with a bootstrap, which acts as the entry point into the physical layer frame. That is, an ATSC 3.0 receiver will search for a bootstrap to identify and synchronize with the beginning of an ATSC 3.0 physical layer frame.
  • the bootstrap has a very distinct structure which allows it to be easily identified by a receiver.
  • the bootstrap also carries a small number of very robust signaling fields to indicate initial information that a receiver can use to begin decoding the remainder of the physical layer frame.
  • min_time_to_next indicates a time window during which the next bootstrap of the same version will appear, as discussed in section 6.1.1.1 of Advanced Television Systems Committee, "ATSC Standard: A/321, System Discovery and Signaling", Doc. A/321:2016, March 23/2016 ("A/321” hereafter).
  • An ATSC 3.0 receiver can use this information, optionally together with the length of the corresponding physical layer frame to determine when to search for the bootstrap identifying the beginning of the next physical layer frame of interest.
  • EUTRA LTE is used here as an example wireless communications system or Radio Access Technology (RAT).
  • This RAT is discussed in 3GPP TS 36.300, "EUTRA: Overall description", V15.3.0 (2018-09 ) ("36.300”), for example.
  • the discussions of EUTRA herein are not intended to limit the scope of the present disclosure.
  • the techniques disclosed here may also be applied to various other wireless systems such as 3GPP 5G NR, for example.
  • Example 5G NR parameters are discussed in 3GPP TS 38.300, "NR and NG-RAN Overall Description," V15.3.1 (2018-10 ).
  • EUTRA frames have a time length of 10 ms and are composed of ten subframes, each with a time length of 1 ms, as described in Section 4 of 3GPP TS 36.211, "EUTRA: Physical channels and modulation", V15.3.0 (2018-09 ) ("36.211").
  • Each frame is indexed with a System Frame Number (SFN), which ranges from 0 to 1023, inclusive. Hence, a complete SFN cycle corresponds to a time period of 10.24 seconds.
  • SFN System Frame Number
  • An EUTRA handset (or LTE (User Equipment)) can be instructed to transmit data, receive data, or both for a given subframe.
  • an EUTRA base station (BS) can transmit data, receive data, or both for a particular subframe.
  • remaining idle i.e. no transmission or reception
  • UEs may be instructed to transmit, receive, or remain idle at other granularities in addition to or in place of subframes.
  • DRX Discontinuous reception
  • MAC Medium Access Control
  • DRX allows a UE to discontinue monitoring the Physical Downlink Control Channel (PDCCH) for a certain period of time, which can essentially allow a UE to disable reception and transmission for this amount of time.
  • PDCH Physical Downlink Control Channel
  • DRX is often used as a power-saving measure for battery-operated UEs.
  • a DRX cycle corresponds to a particular length of time which is divided into Active Time (when a UE may be actively receiving and/or transmitting) and non-Active Time (when the LTE is not actively receiving or transmitting).
  • a number of different UE-specific timers control when a UE is considered to be in Active Time (and, conversely, when the UE is considered to be in non-Active Time). These timers can be configured on a per-UE basis and can be configured quite precisely to control the Active Time duration. Additionally, a DRX Command MAC control element (discussed in Section 6.1.3.3 of 36.321) can be sent to a LTE to instruct the LTE to stop certain DRX-related timers, which generally results in the UE immediately entering non-Active Time.
  • Figure 14 shows an example of DRX activity at a UE, where the DRX cycle length is 40 subframes (40 ms) and the Active Time of the DRX cycle is 10 subframes (10 ms). Consequently, the non-Active Time of this DRX cycle is 30 ms in length.
  • Each active UE on a particular EUTRA carrier can be configured individually for DRX operation with DRX parameters that are independent of any other UE's configuration (i.e. a particular UE can be configured with DRX parameters that are either the same or different as the DRX parameters for another UE).
  • DRX parameters include, but are not limited to, the length of the DRX cycle, the amount of Active Time, and the particular starting point (a specific subframe) of a UE's DRX cycle.
  • DRX cycle time lengths may include, but are necessarily not limited to, ⁇ 10, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2048, 2560 ⁇ ms.
  • DRX On Duration Timer values (which can control the amount of Active Time) may include, but are not necessarily limited to, ⁇ 1, 2, 3, 4, 5, 6, 8, 10, 20, 30, 40, 50, 60, 80, 100, 200 ⁇ ms.
  • the DRX cycle start offset i.e. when Active Time is considered to begin
  • the following discussion relates to techniques for sharing spectrum between cellular communications such as EUTRA communications and broadcast physical frames such as ATSC 3.0 frames.
  • the disclosed techniques facilitate dynamic sharing of spectrum between multiple Radio Access Technologies (RATs).
  • each of the sharing RATs is able to transmit often enough (e.g. at least once every several seconds, and more preferably once or more per second) to support near real-time operation.
  • Near real-time operation implies that many applications such as video or audio broadcast, web browsing, email, streaming, file downloads, etc, can be supported in a manner that is transparent to the end user(s), but applications requiring real-time bi-directional communications (e.g. voice conversations) may not operate in a sufficiently satisfactory manner for the end user(s).
  • the shared RF spectrum referred to by this disclosure may originate from any of the participating RATs.
  • the RF spectrum may originally have been allocated for ATSC 3.0 use, but may then be shared dynamically between ATSC 3.0 and EUTRA transmissions for a certain period of time (or possibly for an indefinite period of time) before eventually reverting back to full-time ATSC 3.0 transmissions.
  • the RF spectrum may originally have been allocated for EUTRA use, but is then shared dynamically between EUTRA and ATSC 3.0 transmissions for a certain period of time (or possibly for an indefinite period of time) before eventually reverting back to full-time EUTRA transmissions.
  • the system bandwidths of the ATSC 3.0 and EUTRA transmissions may be the same as each other or may be different.
  • a narrower bandwidth ATSC 3.0 signal may be transmitted in a wider bandwidth EUTRA RF channel allocation, or a narrower bandwidth EUTRA signal may be transmitted in a wider bandwidth ATSC 3.0 RF channel allocation.
  • the shared spectrum may be used to augment other spectrum allocated to a particular RAT, e.g., using carrier aggregation or channel bonding.
  • Each of the multi-RAT transmissions originates from a transmitter capable of transmitting waveforms according to the corresponding RAT.
  • Multi-RAT transmissions may originate from distinct transmitters (e.g. separate ATSC 3.0 and EUTRA transmitters) and/or the same transmitter (e.g. a transmitter capable of transmitting both ATSC 3.0 and EUTRA waveforms). In the event of separate transmitters, these transmitters may be co-located or may be positioned at different geographic locations.
  • receivers in the context of this disclosure may receive signals from one or more of the RATs associated with the transmitted waveforms. For example, a receiver may receive only the ATSC 3.0 portion of the transmitted signal, only the EUTRA portion of the transmitted signal, or both the ATSC 3.0 and EUTRA portions of the transmitted signal.
  • consecutive ATSC 3.0 physical layer frames are transmitted with gaps in time between frames.
  • the min_time_to_next signaling field in the bootstrap indicates a time window where the next bootstrap of the same version is located, but there is no stated requirement as to exactly where that next bootstrap will appear within the time window, nor is there a requirement that the time window be positioned such that it includes the end of the current physical layer frame.
  • Figure 15A shows an example of a sequence of ATSC 3.0 physical layer frames with a relatively smaller time gap between successive frames
  • Figure 15B shows an example of a sequence of ATSC 3.0 physical layer frames with a relatively larger time gap between successive frames.
  • the data (e.g. video, audio, captions, etc) being broadcast can be encoded and packed into time-separated physical layer frames such as those shown in Figure 15A and Figure 15B .
  • Receivers in some embodiments, are configured to buffer the decoded data and play the data out according to designated time points in order to provide the appearance of continuous playback to the end user, despite the time discontinuities in the ATSC 3.0 transmitted waveform. This may advantageously provide playback while allowing spectrum sharing with another RAT between frames.
  • Figure 16 shows a technique in which cellular transmissions can occur (e.g., during DRX active intervals) between each broadcast frame in a set of frames (three frames, in the illustrated example).
  • the ATSC 3.0 transmissions may occupy a system bandwidth of 6 MHz (as is the case for North America), with the EUTRA transmissions occupying a bandwidth of 5 MHz.
  • the EUTRA transmissions may represent a Time Division Duplexing (TDD) system or either the downlink or uplink of a Frequency Division Duplexing (FDD) system.
  • TDD Time Division Duplexing
  • FDD Frequency Division Duplexing
  • Figure 16 shows individual single consecutive ATSC 3.0 physical layer frames separated by a time gap, into which is inserted an EUTRA transmission.
  • this diagram is exemplary only, and there may be multiple contiguous ATSC 3.0 frames being transmitted before a time gap occurs, in some embodiments.
  • gaps may be scheduled between sets of two broadcast frames that are contiguous or between sets of three broadcast frames that are contiguous, in some situations, while still maintaining near-real-time shared-spectrum communications.
  • gaps may be scheduled between sets of contiguous broadcast frames having different sizes (e.g., with a gap, then a single broadcast frame, gap, two contiguous broadcast frames, gap, a single broadcast frame, etc.).
  • gap intervals of various lengths between broadcast frames may be scheduled at different points in a sequence of frames.
  • the illustrative EUTRA transmissions shown in Figure 16 may be managed by configuring all active UEs in the EUTRA cell with identical or similar DRX cycles. As shown in the diagram, the EUTRA UEs are configured to wake up from DRX (and enter DRX Active Time) at the beginning of a time gap between successive ATSC 3.0 frames and to enter DRX at the end of that same time gap. In this manner, the EUTRA UEs should not expect to receive EUTRA transmissions during the time period in which ATSC 3.0 frames are transmitted.
  • One exemplary DRX configuration sets the DRX cycle length to 256 ms and the DRX On Duration Timer to 100 ms.
  • the exemplary time-division multiplexing of ATSC 3.0 and EUTRA transmissions as shown in the following table may be achieved.
  • the use of a time-aligned ATSC 3.0 frame here is not mandatory; for example, a symbol-aligned ATSC 3.0 frame of the appropriate length may be used instead.
  • an EUTRA base station regularly and/or periodically transmits at least the following signals and physical channels on the downlink: Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid-ARQ Indicator CHannel (PHICH), Physical Downlink Control CHannel (PDCCH), Cell-specific Reference Signals (CRS), and Positioning Reference Signals (PRS).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid-ARQ Indicator CHannel
  • PDCCH Physical Downlink Control CHannel
  • CRS Cell-specific Reference Signals
  • PRS Positioning Reference Signals
  • the EUTRA base station continues to transmit its regularly-transmitted signals and physical channels as required during the time period in which ATSC 3.0 transmissions occur. If the relative transmit power of the ATSC 3.0 transmitter is significantly larger than the transmit power of the EUTRA base station, then the EUTRA transmissions would appear as a small amount of interference to the ATSC 3.0 transmissions, which may be negated by selection of a sufficiently robust ATSC 3.0 configuration. Any EUTRA UEs that happen to be active may be able to detect those EUTRA transmissions, despite the presence of an interfering ATSC 3.0 transmission.
  • the EUTRA base station suspends all transmissions, including any regularly-transmitted signals and physical channels during the time period in which ATSC 3.0 transmissions occur. In this manner, no interference occurs to the active ATSC 3.0 transmissions.
  • Table 11.2-1 in Section 11.2 of 36.331 specifies the expected time to complete a number of different RRC procedures in EUTRA, ignoring any delays caused by a random access procedure.
  • RRC connection reconfigurations (including a handover within EUTRA) are expected to be completed within 15-20 ms, with a random access procedure possibly requiring another 20-40 ms depending upon the system configuration related to supporting random access.
  • An EUTRA cell broadcasts system information, which provides parameters and other data about that cell's configuration, which in turn allows a UE to connect to that cell. For example, there are a number of System Information Blocks (SIBs) whose contents should be known by a UE before connecting to the corresponding cell.
  • SIBs System Information Blocks
  • the Master Information Block (MIB) provides information required for a UE to acquire System Information Block 1 (SIB1).
  • SIB1 has a fixed broadcast schedule with a 40 ms periodicity and different redundancy versions of the MIB being broadcast every 10 ms within that 40 ms period.
  • SIB1 contains scheduling information about the broadcast schedule of the remaining System Information Blocks, as well as other parameter values.
  • SIB1 has a fixed broadcast schedule with an 80 ms periodicity and different redundancy versions of SIB1 being broadcast every 20 ms within that 80 ms period.
  • SIB2 contains the remaining information required by a UE moving to or already in the RRC_CONNECTED state.
  • SIB2 has a configurable broadcast schedule which is signaled in SIB 1.
  • a time-division multiplexed cellular cell is configured to either broadcast the relevant System Information Blocks only during DRX Active Time.
  • the cell is configured to broadcast that data regularly according to the required schedule, regardless of whether DRX Active Time is in effect or not. In the latter case, system information transmissions during ATSC 3.0 transmissions may appear as interference to the ATSC 3.0 transmission.
  • a cellular network is configured to schedule system information such as SIB2 such that it appears early in the DRX Active Time period, in order to allow UEs to quickly acquire SIB2. This may allow UEs to connect within the interval between broadcast frames, for example. Note, in the EUTRA example however, that a LTE may first need to acquire the MIB and then SIB1 before acquiring SIB2, so system information scheduling should take this into account to ensure that UEs have sufficient time to acquire those three information blocks sequentially within the same DRX Active Time period.
  • the network is configured to set the system information modification period to a large value (e.g., by configuring larger values for modificationPeriodCoeff and defaultPagingCycle (see the RadioResourceConfigCommon information element in Section 6.3.2 of 36.331)) to increase the amount of time over which acquired system information can be considered to remain valid.
  • a large value e.g., by configuring larger values for modificationPeriodCoeff and defaultPagingCycle (see the RadioResourceConfigCommon information element in Section 6.3.2 of 36.331)
  • a UE may acquire the system information of the time-division multiplexed EUTRA carrier during one DRX Active Time period before initiating a connection to the EUTRA base station in the next DRX Active Time period, depending upon the actual time length of the DRX Active Time period.
  • a certain amount of time is required in order to perform tasks such as a random access procedure (which may require multiple attempts at transmitting a random access preamble), requesting a connection from the controlling base station, receiving configuration information from the base station, etc.
  • a sufficient amount of time is provided between consecutive ATSC 3.0 frames so that all of these tasks can be performed within the same DRX Active Time period.
  • the time-division multiplexing arrangement illustrated in Figure 15B may be preferable to that illustrated in Figure 15A , since the former provides a longer continuous time period during which EUTRA is active.
  • a parameter for the maximum allowable number of random access preamble transmission attempts is set to a large value.
  • the EUTRA base station may endeavor to provide random access responses as quickly as possible when detecting a random access preamble that is determined to be potentially affected by time division multiplexing in order to minimize turn-around time during random access procedures.
  • a larger time gap is periodically inserted between two successive ATSC 3.0 frames in order to allow more time for UEs to connect to the EUTRA cell during that longer time period.
  • This concept is illustrated in the example of Figure 17 .
  • one of the regularly-spaced ATSC 3.0 frame intervals has been omitted, thereby allowing the preceding EUTRA transmission to extend over a time period equal in length to two DRX Active Time periods and one ATSC 3.0 frame. This provides a longer time opportunity for UEs to connect to the EUTRA base station during that interval.
  • Such intervals may be inserted periodically or according to some other schedule.
  • a UE if a UE first connects to another EUTRA cell (the source cell), or even a non-EUTRA cell, and is then handed over to the EUTRA carrier that is time-division multiplexed with the ATSC 3.0 transmissions (referred to here as the TDM carrier), then this may reduce the time required for the UE to connect to the TDM carrier.
  • the UE will already be in the RRC_CONNECTED state after connecting to the first EUTRA cell, which eliminates the need to request an RRC connection with the TDM carrier.
  • system information of the TDM carrier can be supplied to the UE as part of the handover message, which eliminates the need to acquire system information from the TDM carrier before connecting to it (although the system information of the TDM carrier still needs to be verified by the UE after completing the handover).
  • the source cell is configured to appropriately time the transmission of the handover message to the UE such that the UE begins its connection to the TDM carrier at the beginning of DRX Active Time for that carrier, thereby advantageously increasing the amount of time that is available for completing the handover before DRX Active Time is over.
  • the above techniques for facilitating a UE to connect to an EUTRA carrier which is time-division multiplexed with ATSC 3.0 transmissions may work with minimal or no changes required to the EUTRA specification. However, it may be useful for such UEs to be aware that EUTRA operations are time-division multiplexed with other wireless transmissions and hence the EUTRA signals will essentially disappear during periodic intervals. It may be necessary to include this within the EUTRA specification. Alternatively, it may be possible to design or modify UEs that can recognize this mode of operation and react to it accordingly. This is especially possible for dual-mode UEs that might receive both ATSC 3.0 and EUTRA transmissions which have been time-division multiplexed together within the same RF channel.
  • Such UEs are configured to receive a constant stream of RF samples for a common system bandwidth (representing the maximum of the configured ATSC 3.0 and EUTRA system bandwidths) and then process those RF samples accordingly depending upon whether the current time period represents an ATSC 3.0 or EUTRA transmission.
  • a common system bandwidth representing the maximum of the configured ATSC 3.0 and EUTRA system bandwidths
  • the UE may operate with multiple component carriers in the downlink direction. That is, the UE is able to simultaneously receive data on two or more EUTRA carriers, with each carrier being located within a separate frequency band.
  • the UE may receive control signaling (e.g. on the PDCCH) on one carrier, with that control signaling indicating relevant downlink transmissions for the LTE on any of the multiple carriers that have been configured for that UE.
  • the carrier that carries control signaling for the UE may be referred to as PCell (Primary Cell), and any supplemental carriers that have also been configured for the UE may be referred to as SCell (Secondary Cell).
  • the UE may first connect to a non-time-division-multiplexed EUTRA carrier in a first frequency band, which is then configured as that UE's PCell.
  • the UE may then be additionally configured with a supplemental time-division-multiplexed EUTRA carrier as SCell in a second frequency band.
  • the base station may schedule SCell transmissions to the UE on the TDM SCell carrier only during time periods when ATSC 3.0 transmissions do not occur.
  • the base station may schedule PCell transmissions to the LTE, but not SCell transmissions, during time periods when ATSC 3.0 transmissions occur.
  • the UE may be configured to enter DRX on the SCell carrier and/or the PCell carrier during time periods when ATSC 3.0 transmissions occur.
  • any such abrupt change in transmission power may cause unwanted spurious RF emissions which may cause interference to other wireless signals. This is especially true for large high-power ATSC 3.0 transmitters where a significant amount of power is present in the transmitted waveform. In these high-power situations, the RF components of the transmitter may in fact be damaged if such sudden fluctuations in the RF power are present.
  • the following discussion presents at least two solutions to this issue.
  • the transmitter is configured to direct the RF power only to certain portions of the frequency spectrum, thereby leaving the remainder of the available frequency spectrum to be occupied by the cellular transmission.
  • the signal from the ATSC 3.0 transmitter may appear as frequency-specific interference to the EUTRA transmitter, with the latter transmitter configured to schedule its transmissions in the portions of the spectrum that were unoccupied (or temporarily vacated) by the ATSC 3.0 transmitter.
  • the average power distribution across the frequency spectrum of an ATSC 3.0 waveform would appear to be essentially constant as shown in the left-hand side of Figure 18 .
  • the broadcast power from the ATSC 3.0 transmitter could be directed to the band edges of the available spectrum with the EUTRA transmitter making use of the central part of the frequency band as shown in the right-hand side of Figure 18 .
  • This ATSC 3.0 transmission in Figure 18 may not be a valid ATSC 3.0 transmission, but may instead represent the transmission of dummy data on OFDM carriers belonging to the corresponding frequency intervals.
  • a frequency gap or frequency guard interval may be present between the dummy ATSC 3.0 transmission(s) and the EUTRA transmission in order to mitigate any adjacent channel interference to the EUTRA transmission. Note that Figure 18 is simply an example and that the ATSC transmitter may direct its broadcast power to other portions of the available spectrum.
  • an OFDM-based system such as ATSC 3.0 (and EUTRA) by modulating the OFDM carriers in part(s) of the spectrum with greater-than-normal power while not modulating (i.e. applying a null, zero, or significantly reduced power) the OFDM carriers in the other part(s) of the spectrum reserved for EUTRA operation.
  • a transmitter e.g., a lower-powered local ATSC 3.0 transmitter
  • a transmitter may be able to switch off its RF transmission power without damaging the RF circuitry and other RF components.
  • this may use a small but non-zero amount of time in order to go from full power to zero, and vice versa. Consequently, a small time gap or guard interval to allow for this transition may be left between the end of an ATSC 3.0 frame and the beginning of an EUTRA transmission.
  • a similar guard period may be positioned between the end of an EUTRA transmission and the beginning of an ATSC 3.0 frame. This guard period may prevent possible mutual interference between an ATSC 3.0 transmission and an EUTRA transmission which have been time-division multiplexed into the same RF spectrum. This is illustrated in Figure 19 .
  • a guard period will also mitigate any mutual interference that might occur due to any possible offset in time synchronization between the different transmitters.
  • EUTRA base stations are generally expected to have lower transmit power than will high-power ATSC 3.0 transmitters and should thus have fewer issues with turning their RF power on and off.
  • dynamic transmit power on/off functionality is already present in EUTRA functionalities such as TDD operation (e.g. Section 4.2 of 36.211), MBSFN subframes where PMCH and MBSFN reference signals are not transmitted in the MBSFN region of MBSFN subframes (Sections 6.1 and 6.10.2 of 36.211), and Almost Blank Subframes (Section 16.1.5 of 36.300). Switching on and off of RF power at a EUTRA base station may be handled accordingly.
  • Embodiments described in this disclosure may be realized in any of various forms. For example, some embodiments may be realized as a computer-implemented method, a computer-readable memory medium, or a computer system. Other embodiments may be realized using one or more custom-designed hardware devices such as ASICs. Other embodiments may be realized using one or more programmable hardware elements such as FPGAs.
  • a non-transitory computer-readable memory medium may be configured so that it stores program instructions and/or data, where the program instructions, if executed by a computer system, cause the computer system to perform a method, e.g., any of the method embodiments described herein, or, any combination of the method embodiments described herein, or, any subset of any of the method embodiments described herein, or, any combination of such subsets.
  • a device e.g., a UE, a broadcast receiver, or a base station
  • a device may be configured to include a processor (or a set of processors) and a memory medium, where the memory medium stores program instructions, where the processor is configured to read and execute the program instructions from the memory medium, where the program instructions are executable to implement any of the various method embodiments described herein (or, any combination of the method embodiments described herein, or, any subset of any of the method embodiments described herein, or, any combination of such subsets).
  • the processor may be a central processing unit (CPU) or a digital signal processor (DSP), for example.
  • the device may be realized in any of various forms.

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  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (15)

  1. Un procédé comprenant :
    la diffusion sans fil en broadcast (910), par une station de base de broadcast (102A), d'un ensemble commun de données audio et vidéo vers une pluralité de dispositifs récepteurs de broadcast en utilisant une bande de fréquence particulière et un ensemble de trois ou plus trames de broadcast consécutives, chaque trame de broadcast de l'ensemble de trois ou plus trames de broadcast consécutives comprenant un préambule, la station de base de broadcast (102A) ne recevant aucune donnée de contenu en provenance d'un quelconque dispositif récepteur de broadcast ; et
    la cessation de la diffusion en broadcast (920), sur la base d'un ou plusieurs laps de temps prédéterminé entre trames de broadcast, entre chacune des trames de broadcast de l'ensemble de trames de broadcast, pour permettre à une ou plusieurs stations de base cellulaires (102B) d'opérer des communications sans fil cellulaires de données par commutation de paquets en utilisant la bande de fréquence particulière.
  2. Le procédé de la revendication 1, comprenant en outre une concentration de puissance d'émission vers une ou plusieurs parties de la bande de fréquence particulière pour obtenir la cessation.
  3. Le procédé de la revendication 1, dans lequel la cessation de la diffusion en broadcast comprend une baisse progressive de la puissance d'émission de broadcast pendant un intervalle de garde.
  4. Le procédé de la revendication 1, dans lequel au moins l'un des laps de temps est suffisant pour qu'un dispositif cellulaire obtienne une information système et se connecte à l'une des une ou plusieurs stations de base cellulaires (102B).
  5. Un procédé comprenant :
    l'exécution, par une station de base cellulaire (102B), d'une communication cellulaire à commutation de paquets avec un ou plusieurs dispositifs cellulaires en utilisant une bande de fréquence particulière ; et
    la cessation, par la station de base cellulaire (102B), des communications utilisant la bande de fréquence particulière, pendant une transmission planifiée de trames de broadcast en provenance d'une station de base de broadcast (102A), l'exécution de la communication cellulaire à commutation de paquets ayant lieu entre chaque trame de broadcast d'un ensemble de trois ou plus trames de broadcast consécutives, chaque trame de broadcast de l'ensemble de trois ou plus trames de broadcast consécutives comprenant un préambule.
  6. Le procédé de la revendication 5, dans lequel comprenant en outre :
    la planification d'intervalles de réception discontinue pour un ou plusieurs dispositifs cellulaires (106) pendant des intervalles entre les trames de broadcast planifiées.
  7. Le procédé de la revendication 6, comprenant en outre :
    la transmission d'un certain ensemble d'informations système seulement pendant des intervalles de réception discontinue actifs.
  8. Le procédé de la revendication 5, comprenant en outre :
    la transmission d'un certain ensemble d'informations système à l'intérieur d'un laps de temps seuil après une fin planifiée de l'une des trames de broadcast.
  9. Le procédé de la revendication 5, comprenant en outre :
    le séquencement d'un handover vers la station de base cellulaire (102B) pour qu'il se produise dans les limites d'un laps de temps seuil après une fin planifiée de l'une des trames de broadcast.
  10. Le procédé de la revendication 5, dans lequel la cessation comprend la cessation de la transmission de signaux transmis régulièrement dans la bande de fréquence particulière.
  11. Le procédé de la revendication 5, comprenant en outre :
    l'exécution d'une communication cellulaire à commutation de paquets avec au moins l'un des un ou plusieurs dispositifs mobile en utilisant une autre bande de fréquence comme porteuse primaire, la bande de fréquence particulière étant une porteuse secondaire.
  12. Le procédé de la revendication 11, comprenant en outre :
    la transmission d'une signalisation de contrôle pour la porteuse secondaire via la porteuse primaire.
  13. Un appareil comprenant :
    un ou plusieurs éléments de traitement configurés pour :
    recevoir et décoder une pluralité de trames de broadcast consécutives d'un ensemble de trois ou plus trames de broadcast consécutives en provenance d'une station de base de broadcast (102A), utilisant une bande de fréquence particulière, pour déterminer des données de broadcast audio et vidéo, chaque trame de broadcast de l'ensemble de trois ou plus trames de broadcast consécutives comprenant un préambule ; et
    opérer une communication cellulaire à commutation de paquets avec une ou plusieurs stations de base cellulaires (102B) en utilisant la bande de fréquence particulière pendant des laps de temps prédéterminés entre chacune des trames de broadcast de l'ensemble de trois ou plus trames de broadcast consécutives.
  14. L'appareil de la revendication 13, dans lequel l'appareil est configuré pour déterminer automatiquement les laps de temps prédéterminés sur la base de parties d'amorçage des trames de broadcast.
  15. L'appareil de la revendication 13, dans lequel au moins l'un des laps de temps prédéterminés est suffisant pour qu'un dispositif cellulaire obtienne une information système et se connecte à l'une des une ou plusieurs stations de base cellulaires (102B).
EP19802006.7A 2018-11-12 2019-10-23 Accès à un spectre partagé pour des communications de diffusion et bidirectionnelles à commutation de paquets Active EP3881618B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16/186,768 US11234288B2 (en) 2014-08-25 2018-11-12 Shared spectrum access for broadcast and bi-directional, packet-switched communications
PCT/US2019/057617 WO2020101852A1 (fr) 2018-11-12 2019-10-23 Accès à un spectre partagé pour des communications de diffusion et bidirectionnelles à commutation de paquets

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EP3881618B1 true EP3881618B1 (fr) 2023-05-10

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CN115134821A (zh) * 2021-03-24 2022-09-30 中国电信股份有限公司 通信资源配置方法、装置、基站和存储介质

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TW202025807A (zh) 2020-07-01
EP3881618A1 (fr) 2021-09-22
WO2020101852A1 (fr) 2020-05-22
CN112997550A (zh) 2021-06-18

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